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CBSE Class 11 Biology Worksheet - Digestion and Absorbtion. Students can download these worksheets and practice them. This will help them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
CLASS XI DIGESTION AND ABSORPTION WORKSHEET- 1
1. Define digestion.
2. Why do you refer to human teeth as:
3. Give the dental formula of
a) Human adult
b) Human milk teeth
4. Draw a neat labeled diagram showing the anatomy of wall layers of alimentary canal. Also mention the names of different layers.
5. Name the salivary glands.
6. What are villi? Write their function.
7. Draw neat labeled diagrams of the following:
a) Section of small intestinal mucosa showing villi.
b) The duct systems of liver, gall bladder and pancreas.
8. Pancreas is known as heterogenous gland. Give reason.
9. Differentiate between ‘bolus’ and ‘chyme’.
10. Bile does not contain any enzyme. Still it is important for digestion. Justify.
11. Describe the process of starch digestion in the alimentary canal.
12. Harsh took bread and butter for his breakfast. Explain the course of digestion of butter in his digestive system. Also mention the enzymes involved.
13. Make a table showing different enzymes involved in protein digestion, their site of secretion and function
14. List the functions of large intestine.
15. Briefly describe two disorders associated with digestive system.
Ques. The initial step in the digestion of milk in humans is carried out by
(a) lipase (b) trypsin
(c) rennin (d) pepsin.
Ques. A healthy person eats the following diet-5 gm raw sugar, 4 gm albumin, 10 gm pure buffalo ghee adultrated with 2 gm vegetable ghee (hydrogenated vegetable oil) and 5 gm lignin. How many calories he is likely to get?
(a) 126 (b) 164
(c) 112 (d) 144
Ques. Which enzymes are likely to act on the baked potatoes eaten by a man, starting from the mouth and as it moves down the alimentary canal?
(a) Pancreatic amylase → Salivary amylase → Lipases
(b) Disaccharidase like maltase → Lipases → Nucleases
(c) Salivary amylase → Pancreatic amylase → Disaccharidases
(d) Salivary maltase → Carboxypeptidase → Trypsinogen
Ques. If for some reason our goblet cells are nonfunctional, this will adversely affect
(a) production of somatostatin
(b) secretion of sebum from the sebaceous glands
(c) maturation of sperms
(d) smooth movement of food down the intestine.
Ques. If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen?
(a) The pancreatic enzymes and specially the trypsin and lipase will not work efficiently.
(b) The pH of stomach will fall abruptly.
(c) Steapsin will be more effective.
(d) Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones.
Ques. Which one of the following pairs of food components in humans reaches the stomach totally undigested ?
(a) Starch and fat (b) Fat and cellulose
(c) Starch and cellulose (d) Protein and starch
Ques. What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor?
(a) In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin.
(b) Enterokinase will not be released from the duodenal mucosa and so trypsinogen is not converted to trypsin.
(c) Gastric juice will be deficient in chymosin.
(d) Gastric juice will be deficient in pepsinogen.
Ques. Hydrolytic enzymes which act on low pH are called as
(a) proteases (b) α-amylases
(c) hydrolases (d) peroxidases.
Ques. In mammals milk is digested by the action of
(a) rennin (b) amylase
(c) intestinal bacteria (d) invertase.
Ques. A person who is eating boiled potato, his food contains the component
(a) cellulose which is digested by cellulase
(b) starch which is digested
(c) lactose which is not digested
(d) DNA which can be digested by pancreatic DNase.
Ques. If pancreas is removed, the compound which remain undigested is
(a) proteins (b) carbohydrates
(c) fats (d) all of these.
Ques. What is common among amylase, rennin and trypsin?
(a) These are produced in stomach.
(b) These act at a pH lower than 7.
(c) These all are proteins.
(d) These all are proteolytic enzymes.
Ques. Choose the correct enzyme - substrate pair.
(a) Carbohydrate - Lipase
(b) Maltase - Lactose
(c) Rennin - Casein
(d) Protein - Amylase
Ques. Which of the following is the function of enterogastrone?
(a) It inhibits the secretion of gastric juice.
(b) It stimulates the secretion of digestive juices in the stomach.
(c) It stimulates the flow of pancreatic juice.
(d) It regulates the flow of bile.
Ques. Which of the following is correct pairing of site of action and substrate of rennin?
(a) Mouth - Starch
(b) Small intestine - Protein
(c) Stomach - Casein
(d) Stomach - Fat
Ques. Most of the fat digestion occurs in
(a) rectum (b) stomach
(c) duodenum (d) small intestine.
Ques. Secretion of gastric juice is stopped by
(a) gastrin (b) pancreozymin
(c) cholecystokinin (d) enterogastrone.
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